theres no such thing as a free lunch im not trying to rain on your parade but if the manufacturer could easily and safely extracted more hp then they would have any overboost is going to have a detrimental effect on the lifetime of the turbo engine transmission etc as well as significantly decrease your mileage and increase your pollution all that extra heat and pressure has an effect on the engine i really doubt the factory engineers overdesigned the engine block to handle that load maybe they did and to save costs used the same tranny as in the